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安裝express 后輸入node app.js 后報錯“Error: Cannot find module 'expresss'”是怎么回事？

PS G:\前端\node-debug> node app.js
internal/modules/cjs/loader.js:584
??? throw err;
??? ^

Error: Cannot find module 'expresss'
??? at Function.Module._resolveFilename (internal/modules/cjs/loader.js:582:15)
??? at Function.Module._load (internal/modules/cjs/loader.js:508:25)
??? at Module.require (internal/modules/cjs/loader.js:637:17)
??? at require (internal/modules/cjs/helpers.js:22:18)
??? at Object.<anonymous> (G:\前端\node-debug\app.js:1:81)
??? at Module._compile (internal/modules/cjs/loader.js:701:30)
??? at Object.Module._extensions..js (internal/modules/cjs/loader.js:712:10)
??? at Module.load (internal/modules/cjs/loader.js:600:32)
??? at tryModuleLoad (internal/modules/cjs/loader.js:539:12)
??? at Function.Module._load (internal/modules/cjs/loader.js:531:3)